NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Humans have a very significant feature that will use tools. A variety of tools meet people's lives and work needs. People can connect the cable failure through special instrument detection, we have learned the cable recognizer before.
Today, we have a very significant feature that we will use tools. A variety of tools meet people's lives and work needs. People can connect the cable failure through special instrument detection, we have learned the cable recognizer before.
Today we have to continue to understand new equipment, buried line detectors, and how it is used. The active emission method of the buried line detector can be basically divided into three categories: straight and uniform, clamp method, induction method. The frequency of use of the pipeline detector can be basically divided into two categories, namely high frequency and low frequency.
Low frequency reduction, long transmission distance, small radiation capacity, not easy to string, but penetration, high frequency, strong penetration ability, good radiation capacity, but the attenuation is relatively close. Therefore, we should choose the appropriate frequency according to different methods during use. Method and frequency selection: 1, the direct connection method is directly applied to the signal from the transmitter on the tube line.
The direct connection method is the best way to signal, which is generally a preferred method in the case of condition. Using direct connection, the signal is stable, and it is not easy to interfere with other pipelines. In practical operations, such as cast iron pipelines, steel pipes, etc., the use of direct-connecting methods can be used, in which the frequency of use can be selected according to the line material, such as steel pipes, we can use low frequencies, because the steel pipe is electrically conductive, and we can transfer using low frequencies. farther.
However, it is worth noting that the direct connection signal will be transmitted in two-way transmission along the line, and the distribution is uneven, the grounding point should have a certain distance from the pipeline (>5M), grounding should be inserted into the soil, and water will be water to reduce the ground resistance to facilitate signal transmission. 2, clamp method: When the transmitter signal cannot directly load the pipeline, we can choose this approach. This approach is to couple the transmitter's signal through the clamps on the target line.
This method is suitable for communication lines, power lines, and the like. Usually we use this method, you can select the frequency of use according to the surrounding interference. When the surrounding interference is small, we can use high frequency induction when the conductivity of the pipeline is very poor.
In general, we can use a frequency of about 33 kHz to detect. Be careful when in use, the jaws of the clamp should be closed. Although the method is more convenient to apply signals, the transmission of the distance to the signal is not as stable.
3, induction method: The sensing method is the name suggests, that is, the signal of the transmitter's signal is directly in contact with the form of non-contact. In general, the method can be selected as a third method only if the direct connection and clamps cannot be used. However, this method is affected by the surrounding environment. When the car passes, or when the line is next to the metal, there will be a lot of interference.
Therefore, we must pay attention when we choose the frequency, try to avoid using high frequencies, because the high frequency excitation is large, which will cause severe interference between the pipeline signals. The above is the method of use of the buried pipeline detector, I hope that people need to help.
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